#myTXT{
    width:70%;
    margin:auto;
    border:1px dashed grey;
}
header{
    width:100%;
    height:50px;
    line-height: 50px;
    font-size: 16px;
    text-align: center;
}
main{
    font-size:20px;
    line-height: 40px;
    font-family: "楷体";
    width:80%;
    margin:10px auto 50px;
}
object pre{
    font-size:50px;
    font-family: "楷体";
}